COSC 354 - Test #2 Questions With Complete
Solutions
What are some properties of concrete? - correct answer 1. Does not rot or burn
2. Relatively low in cost
3. Used for every building purpose
4. Only major structural material commonly manufactured on site
5. No form of its own
6. No useful tensile strength
What makes up concrete? - correct answer 1. Coarse Aggregate
2. Fine Aggregate
3. Portland Cement
4. Water
What is coarse aggregate generally? - correct answer Gravel or crushed stone
What is fine aggregate generally? - correct answer sand
What elements are required to create cement? - correct answer 1. Lime
2. Iron
3. Silica
4. Alumina
, What is "Clinker" - correct answer Clinker is the material produced from the
kilning stage of creating cement. It is pulverized to a powder finer than flour.
What is Gypsum - correct answer Gypsum is a material added to clinker to act as a
retardant during the later concrete curing process.
General Aggregate Gradation Rule - correct answer Generally, aggregate should be
no larger than three-fourths of the clear spacing between bars or one-third the
depth of a slab.
Pozzolans - correct answer Materials that react with the calcium hydroxide in wet
concrete to form cementing compounds.
Examples of Pozzolans - correct answer 1. Fly Ash
2. Silica Fume
3. Natural Pozzolans
4. High-reactivity metakaolin
Hydraulic Cements - correct answer Reacts directly with water to form a
cementitious compound. Improves workability, increases strength, reduces
permeability, reduces temperature rise during curing, and improves sulfate
resistance.
Concrete Admixtures - correct answer Chemical ingredients that may be added to
concrete to alter its properties in various ways
Solutions
What are some properties of concrete? - correct answer 1. Does not rot or burn
2. Relatively low in cost
3. Used for every building purpose
4. Only major structural material commonly manufactured on site
5. No form of its own
6. No useful tensile strength
What makes up concrete? - correct answer 1. Coarse Aggregate
2. Fine Aggregate
3. Portland Cement
4. Water
What is coarse aggregate generally? - correct answer Gravel or crushed stone
What is fine aggregate generally? - correct answer sand
What elements are required to create cement? - correct answer 1. Lime
2. Iron
3. Silica
4. Alumina
, What is "Clinker" - correct answer Clinker is the material produced from the
kilning stage of creating cement. It is pulverized to a powder finer than flour.
What is Gypsum - correct answer Gypsum is a material added to clinker to act as a
retardant during the later concrete curing process.
General Aggregate Gradation Rule - correct answer Generally, aggregate should be
no larger than three-fourths of the clear spacing between bars or one-third the
depth of a slab.
Pozzolans - correct answer Materials that react with the calcium hydroxide in wet
concrete to form cementing compounds.
Examples of Pozzolans - correct answer 1. Fly Ash
2. Silica Fume
3. Natural Pozzolans
4. High-reactivity metakaolin
Hydraulic Cements - correct answer Reacts directly with water to form a
cementitious compound. Improves workability, increases strength, reduces
permeability, reduces temperature rise during curing, and improves sulfate
resistance.
Concrete Admixtures - correct answer Chemical ingredients that may be added to
concrete to alter its properties in various ways
